Modified Peck Equation Method for Shield Tunnel Oblique Crossing Upper Railway

Abstract:

The Peck empirical equation is the most common method in the calculation of upper railway settlement at shield tunnel cross section. However, due to the shield tunnel oblique crossing upper railway, shield tunnel cross section is no more parallel to the upper railway direction and the settlement cannot be expressed as Gaussian distribution. The shield angle coefficients are proposed to modify the Peck equation with consideration of oblique angle, tunnel gradient and upheaval. The modified Peck equation is verified by finite element numerical analysis, which is applicable for settlement expression in different sections. And with the different settlement and composite irregularity being obtained by the modified Peck method, the rail surface irregularity is affected. With dynamic simulated analysis, the influence on derail coefficient and wheel load reduction rate is researched.